I can't help with the meter for testing tension. After my brother and I refurbished my sister's treadle and hearing about how much she enjoyed treadling, I decided I would give it another try. I did so on a 27-4. I used
http://mysewingmachineobsession.blog...-assembly.html for cleaning and assembling the tension assembly. I have also found
http://www.treadleon.net/sewingmachi...huttlefit.html and
http://www.treadleon.net/sewingmachi...vsshuttle.html to be helpful.
When I was researching for my reply, I looked at my manuals for the long shuttle machines. I found the reformatted one from Singer -
https://res.cloudinary.com/singer-se.../268_27_28.pdf - has a note on page 14 of that pdf that says that the needle tension
"should be regulated only when the presser foot is down." I went and looked at the other manuals and couldn't find those instructions where they talk about adjusting the tensions in the 27-28 manuals, but did in the 127-128 manuals. The difference being that the 127-128 have the pin that releases the tension when the pressure foot is up. The 27-28 have that spoon shaped release for releasing the needle tension when removing the fabric that had been sewn.
Another thread that might help is
Singer 27-4 Treadle Tension Problems
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Janey - Neat people never make the exciting discoveries I do.
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